DirectFB把内容同时输出到主副surface
一直忙项目，很长时间没有更新博客了。
近期碰到一个问题， 就是设定了DirectFB的主Surface输出到高清接口，比如HDMI， 而副Surface的内容则要输出到标清接口，比如CVBS。
我不想一条语句调用两次，分别向不同的Surface画， 研究了一下， Directfb是可以做到在输出到主Surface的同时，flip一份到副Surface的。
具体代码如下：
#include <stdio.h>#include <directfb.h> static IDirectFB *dfb = NULL;static IDirectFBSurface *primary = NULL;static IDirectFBDisplayLayer* secondaryLayer = NULL;static IDirectFBSurface* secondarySurface = NULL;static int screen_width = 0;static int screen_height = 0; #define DFBCHECK(x...) \{ \DFBResult err = x; \if (err != DFB_OK) \{\fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ );\DirectFBErrorFatal( #x, err );\}\} int main(int argc, char **argv){DFBSurfaceDescription dsc;DFBDisplayLayerConfig layerCfg; DFBCHECK (DirectFBInit (&argc, &argv));DFBCHECK (DirectFBCreate (&dfb)); // DFBCHECK (dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));dsc.flags = DSDESC_CAPS;dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING;DFBCHECK (dfb->CreateSurface( dfb, &dsc, &primary ));DFBCHECK (primary->SetColor (primary, 0xff, 0x00, 0x00, 0xff));DFBCHECK (primary->GetSize (primary, &screen_width, &screen_height));DFBCHECK (primary->FillRectangle (primary, 0, 0, screen_width, screen_height)); DFBCHECK (primary->SetColor (primary, 0x80, 0x80, 0xff, 0xff));DFBCHECK (primary->DrawLine (primary,0, screen_height / 6,screen_width - 1, screen_height / 6));DFBCHECK (primary->Flip (primary, NULL, 0));dfb->GetDisplayLayer(dfb, DLID_PRIMARY+1, &secondaryLayer);secondaryLayer->SetCooperativeLevel(secondaryLayer, DLSCL_ADMINISTRATIVE); layerCfg.flags = DLCONF_SOURCE; layerCfg.source = DLSID_SURFACE;secondaryLayer->SetConfiguration(secondaryLayer, &layerCfg);secondaryLayer->GetSurface(secondaryLayer, &secondarySurface);secondarySurface->Flip(secondarySurface, NULL, DSFLIP_NONE); sleep(10);secondaryLayer->Release( secondaryLayer );secondarySurface->Release( secondarySurface );primary->Release(primary);dfb->Release(dfb);return 0;}